SUMMARY OF CRITICAL ACCOUNTING POLICIES AND ESTIMATES - Summary of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 15,552,980	$ 4,099,655	$ 2,303,725
Restricted cash	100,125	100,170	100,088
Cash and cash equivalents and restricted cash as shown in the consolidated statements of cash flows	$ 15,653,105	$ 4,199,825	$ 2,403,813	$ 2,849,831